[ClH:1].[NH2:2][C:3]1[N:11]=[C:10]([O:12][CH2:13][CH2:14][CH2:15][CH3:16])[N:9]=[C:8]2[C:4]=1[N:5]=[C:6](OC)[N:7]2[CH2:17][CH:18]1[CH2:23][CH2:22][N:21](C(OC(C)(C)C)=O)[CH2:20][CH2:19]1>O1CCOCC1.CO>[ClH:1].[CH2:13]([O:12][C:10]1[N:9]=[C:8]2[C:4]([N:5]=[CH:6][N:7]2[CH2:17][CH:18]2[CH2:19][CH2:20][NH:21][CH2:22][CH2:23]2)=[C:3]([NH2:2])[N:11]=1)[CH2:14][CH2:15][CH3:16]4N hydrogen chloride in dioxane (5.3 mL) was added to a solution of 1,1-dimethylethyl 4-{[6-amino-2-(butyloxy)-8-(methyloxy)-9H-purin-9-yl]methyl}-1-piperidinecarboxylate (630 mg) in methanol (16 mL). After 4.5 hours at room temperature, the reaction mixture was concentrated and dried under high vacuum.
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